PERITRICHA 



851 



H. aesculacantha Jarocki and Jacubowska (Fig. 361, 6). 30-52ju by 

 24-40/z ; in stagnant water. 



Genus Opisthonecta Faure-Fremiet. Conical; ends broadly 

 rounded; a ring of long cilia close to aboral end; adoral zone about 

 1.1 turns, composed of 2 parallel rows; a papilla with about 12 long 

 cilia, just above the opening into vestibule; macronucleus sausage- 



Fig. 361. a, Astylozoonfallax, X170 (Engelmann) ; b, Hastatella aescula- 

 cantha, X580 (Jarocki); c, d, pisthonecta henneguyi (c, X335 (Lynch and 

 Noble); d, a cyst in life, X340 (Rosenberg)); e, Ophridium sessile, X65 

 (Kent); f, 0. vernalis, X160 (Stokes); g, 0. ectatum, X160 (Mast); h, 

 Scijphidia amphibiarum, X570 (Nenninger); i, Paravorticella clymenellae, 

 X65 (Shumway). 



